The Supreme Court has directed advocate Prashant Bhushan to reveal source of information regarding visitors list at CBI Director's residence and CBI file notings.

The apex court asked Mr Bhushan to give the name of the whistle blower in a sealed envelope.

Meanwhile, CBI Director Ranjit Sinha has told the Supreme Court that 90 percent of the entries in the register are forged while some entries may be genuine.

Sinha also questioned the very existence of the diary and authenticity of its contents.